1. To test your understanding of the global properties of galaxies, do Interactive Exercise 16-1 on the Web. You can print out your answers, if required.
2. To test your understanding of the local group of galaxies, do Interactive Exercise 16-2 on the Web. You can print out your answers, if required.
3. To test your understanding of the various types of galaxies, do Interactive Exercise 16-3 on the Web. You can print out your answers, if required.
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